UBUNTU: SAUCE: Unregister input device only if it is registered

BugLink: https://bugs.launchpad.net/bugs/839238

dev2 is not registered in alps_model_quirk_enabled mode, do not
unregister while disconnecting.

Signed-off-by: Wen-chien Jesse Sung <jesse.sung@canonical.com>
Acked-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Leann Ogasawara <leann.ogasawara@canonical.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c
index da20b627ebd..9adff607f86 100644
--- a/drivers/input/mouse/alps.c
+++ b/drivers/input/mouse/alps.c
@@ -745,7 +745,8 @@ static void alps_disconnect(struct psmouse *psmouse)
 
         psmouse_reset(psmouse);
         del_timer_sync(&priv->timer);
-        input_unregister_device(priv->dev2);
+        if (!alps_model_quirk_enabled)
+                input_unregister_device(priv->dev2);
         kfree(priv);
 }